arch/tile/kernel/compat.c

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /* Adjust unistd.h to provide 32-bit numbers and functions. */
  16 #define __SYSCALL_COMPAT
  17
  18 #include <linux/compat.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/kdev_t.h>
  21 #include <linux/fs.h>
  22 #include <linux/fcntl.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/signal.h>
  25 #include <asm/syscalls.h>
  26
  27 /*
  28  * Syscalls that take 64-bit numbers traditionally take them in 32-bit
  29  * "high" and "low" value parts on 32-bit architectures.
  30  * In principle, one could imagine passing some register arguments as
  31  * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
  32  * adapt the usual convention.
  33  */
  34
  35 long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
  36 {
  37         return sys_truncate(filename, ((loff_t)high << 32) | low);
  38 }
  39
  40 long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
  41 {
  42         return sys_ftruncate(fd, ((loff_t)high << 32) | low);
  43 }
  44
  45 long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
  46                         u32 dummy, u32 low, u32 high)
  47 {
  48         return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
  49 }
  50
  51 long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
  52                          u32 dummy, u32 low, u32 high)
  53 {
  54         return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
  55 }
  56
  57 long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
  58 {
  59         return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
  60 }
  61
  62 long compat_sys_sync_file_range2(int fd, unsigned int flags,
  63                                  u32 offset_lo, u32 offset_hi,
  64                                  u32 nbytes_lo, u32 nbytes_hi)
  65 {
  66         return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
  67                                    ((loff_t)nbytes_hi << 32) | nbytes_lo,
  68                                    flags);
  69 }
  70
  71 long compat_sys_fallocate(int fd, int mode,
  72                           u32 offset_lo, u32 offset_hi,
  73                           u32 len_lo, u32 len_hi)
  74 {
  75         return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
  76                              ((loff_t)len_hi << 32) | len_lo);
  77 }
  78
  79
  80
  81 long compat_sys_sched_rr_get_interval(compat_pid_t pid,
  82                                       struct compat_timespec __user *interval)
  83 {
  84         struct timespec t;
  85         int ret;
  86         mm_segment_t old_fs = get_fs();
  87
  88         set_fs(KERNEL_DS);
  89         ret = sys_sched_rr_get_interval(pid,
  90                                         (struct timespec __force __user *)&t);
  91         set_fs(old_fs);
  92         if (put_compat_timespec(&t, interval))
  93                 return -EFAULT;
  94         return ret;
  95 }
  96
  97 /* Provide the compat syscall number to call mapping. */
  98 #undef __SYSCALL
  99 #define __SYSCALL(nr, call) [nr] = (call),
 100
 101 /* See comments in sys.c */
 102 #define compat_sys_fadvise64_64 sys32_fadvise64_64
 103 #define compat_sys_readahead sys32_readahead
 104
 105 /* Call the trampolines to manage pt_regs where necessary. */
 106 #define compat_sys_sigaltstack _compat_sys_sigaltstack
 107 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
 108 #define sys_clone _sys_clone
 109
 110 /*
 111  * Note that we can't include <linux/unistd.h> here since the header
 112  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 113  */
 114 void *compat_sys_call_table[__NR_syscalls] = {
 115         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 116 #include <asm/unistd.h>
 117 };